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  <pre><span class="ruby-comment cmt"># File alien.rb, line 10</span>
  <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>
    <span class="ruby-keyword kw">super</span>
    
    <span class="ruby-ivar">@image</span> = <span class="ruby-constant">Engine</span><span class="ruby-operator">::</span><span class="ruby-constant">Game</span>.<span class="ruby-identifier">images</span>[<span class="ruby-value str">&quot;alien&quot;</span>]
    <span class="ruby-ivar">@x</span> = <span class="ruby-identifier">rand</span>(<span class="ruby-constant">Engine</span><span class="ruby-operator">::</span><span class="ruby-constant">Game</span><span class="ruby-operator">::</span><span class="ruby-constant">ScreenWidth</span>)
    <span class="ruby-ivar">@y</span> = <span class="ruby-operator">-</span><span class="ruby-ivar">@image</span>[<span class="ruby-value">0</span>].<span class="ruby-identifier">height</span> <span class="ruby-operator">/</span> <span class="ruby-value">2</span>
    <span class="ruby-ivar">@z</span> = <span class="ruby-constant">ZOrder</span><span class="ruby-operator">::</span><span class="ruby-constant">Alien</span>
    <span class="ruby-ivar">@radius</span> = <span class="ruby-value">20</span>
    
    <span class="ruby-comment cmt"># assign random speeds to the alien</span>
    <span class="ruby-ivar">@speedx</span> = <span class="ruby-identifier">rand</span>(<span class="ruby-constant">MaxSpeedX</span> <span class="ruby-operator">*</span> <span class="ruby-value">2</span>) <span class="ruby-operator">-</span> <span class="ruby-constant">MaxSpeedX</span>
    <span class="ruby-ivar">@speedy</span> = <span class="ruby-identifier">rand</span>(<span class="ruby-constant">MaxSpeedY</span> <span class="ruby-operator">-</span> <span class="ruby-constant">MinSpeedY</span>) <span class="ruby-operator">+</span> <span class="ruby-constant">MinSpeedY</span>
  <span class="ruby-keyword kw">end</span></pre>
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